Cambiar tasa de refresco del monitor

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Hola amigos nuevamente aqui en busca de su ayuda, quiesiera que me ayuden no se como cambiar la tasa de refresco de mi monitor es un Samsung Syncmaster 550v que ni si quiera mi suse 10 SLE lo reconoce asi que probe con otro driver samsung y cambie las frecuencias vewrtical y horizontal en el xorg.conf pero la tasa de refresco no se en donde cambiarla la cual esta a 85Hz y quisiera ponerla solamente a 75 Hz, aqui posteo la el xorg.conf a ver si me indican en que lugar cambio la tasa de refresco.

# /.../
# SaX generated X11 config file
# Created on: 2007-06-29T15:39:37-0500.
#
# Version: 7.1
# Contact: Marcus Schaefer , 2005
# Contact: SaX-User list
#
# Automatically generated by [ISaX] (7.1)
# PLEASE DO NOT EDIT THIS FILE!
#

Section "Files"
FontPath "/usr/X11R6/lib/X11/fonts/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/local"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/URW"
FontPath "/usr/X11R6/lib/X11/fonts/Speedo"
FontPath "/usr/X11R6/lib/X11/fonts/PEX"
FontPath "/usr/X11R6/lib/X11/fonts/cyrillic"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/latin7/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/baekmuk:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/japanese:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/kwintv"
FontPath "/usr/X11R6/lib/X11/fonts/truetype"
FontPath "/usr/X11R6/lib/X11/fonts/uni:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/CID"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/misc/sgi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/xtest"
FontPath "/opt/kde3/share/fonts"
InputDevices "/dev/gpmdata"
InputDevices "/dev/input/mice"
EndSection

Section "ServerFlags"
Option "AllowMouseOpenFail" "on"
EndSection

Section "Module"
Load "dbe"
Load "type1"
Load "freetype"
Load "extmod"
Load "glx"
Load "v4l"
EndSection

Section "InputDevice"
Driver "kbd"
Identifier "Keyboard[0]"
Option "Protocol" "Standard"
Option "XkbLayout" "es"
Option "XkbModel" "pc102"
Option "XkbRules" "xfree86"
EndSection

Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "AutoSoft" "on"
Option "Device" "/dev/ttyS0"
Option "Emulate3Buttons" "on"
Option "Name" "Serial Mouse"
Option "Protocol" "Auto"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
Driver "mouse"
Identifier "Mouse[3]"
Option "Buttons" "5"
Option "Device" "/dev/input/mice"
Option "Name" "ImPS/2 Generic Wheel Mouse"
Option "Protocol" "explorerps/2"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
DisplaySize 305 230
HorizSync 30-55
Identifier "Monitor[0]"
ModelName "SYNCMASTER 550B(T)"
Option "DPMS"
VendorName "SAMSUNG"
VertRefresh 50-120
UseModes "Modes[0]"
EndSection

Section "Modes"
Identifier "Modes[0]"
Modeline "800x600" 57.97 800 840 928 1056 600 601 604 631
Modeline "800x600" 57.30 800 840 928 1056 600 601 604 631
Modeline "800x600" 56.55 800 840 928 1056 600 601 604 630
Modeline "768x576" 56.56 768 816 896 1024 576 577 580 607
Modeline "768x576" 55.94 768 816 896 1024 576 577 580 607
Modeline "768x576" 55.32 768 816 896 1024 576 577 580 607
Modeline "640x480" 46.80 640 680 744 848 480 481 484 511
Modeline "640x480" 46.37 640 680 744 848 480 481 484 511
Modeline "640x480" 45.93 640 680 744 848 480 481 484 511
EndSection

Section "Screen"
DefaultDepth 16
SubSection "Display"
Depth 15
Modes "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "800x600" "768x576" "640x480"
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection

Section "Device"
BoardName "86C326"
BusID "1:0:0"
Driver "sis"
Identifier "Device[0]"
Option "EnableSiSCtrl" "on"
VendorName "SiS"
EndSection

Section "ServerLayout"
Identifier "Layout[all]"
InputDevice "Keyboard[0]" "CoreKeyboard"
InputDevice "Mouse[1]" "CorePointer"
InputDevice "Mouse[3]" "SendCoreEvents"
Option "Clone" "off"
Option "Xinerama" "off"
Screen "Screen[0]"
EndSection

Section "DRI"
Group "video"
Mode 0660
EndSection

Section "Extensions"
EndSection

Cita: Section

[quote]Section "Monitor"
DisplaySize 305 230
HorizSync 30-55
Identifier "Monitor[0]"
ModelName "SYNCMASTER 550B(T)"
Option "DPMS"
VendorName "SAMSUNG"
VertRefresh 50-120
UseModes "Modes[0]"
EndSection[/quote]

En esta sección debes poner los valores adecuados a tu monitor. Sácalos del manual o de la web del fabricante.
HorizSync
VertRefresh

Salu2.